微信小程序实现顶部导航特效

Page({
  data: {
    // tab切换 
    currentTab: 0,
  },
  swichNav: function (e) {
    console.log(e);
    var that = this;
    if (this.data.currentTab === e.target.dataset.current) {
      return false;
    } else {
      that.setData({
        currentTab: e.target.dataset.current,
      })
    }
  },
  swiperChange: function (e) {
    console.log(e);
    this.setData({
      currentTab: e.detail.current,
    })
 
  },
  onLoad: function (options) {
    // 生命周期函数--监听页面加载
  },
  onReady: function () {
    // 生命周期函数--监听页面初次渲染完成
  },
  onShow: function () {
    // 生命周期函数--监听页面显示
  },
  onHide: function () {
    // 生命周期函数--监听页面隐藏
  },
  onUnload: function () {
    // 生命周期函数--监听页面卸载
  },
  onPullDownRefresh: function () {
    // 页面相关事件处理函数--监听用户下拉动作
  },
  onReachBottom: function () {
    // 页面上拉触底事件的处理函数
  },
  onShareAppMessage: function () {
    // 用户点击右上角分享
    return {
      title: 'title', // 分享标题
      desc: 'desc', // 分享描述
      path: 'path' // 分享路径
    }
  }
})

<view class="page">
 
 <!--顶部导航栏-->
 <view class="swiper-tab">
  <view class="tab-item {{currentTab==0 ? 'on' : ''}}" data-current="0" bindtap="swichNav">Tab1</view>
  <view class="tab-item {{currentTab==1 ? 'on' : ''}}" data-current="1" bindtap="swichNav">Tab2</view>
  <view class="tab-item {{currentTab==2 ? 'on' : ''}}" data-current="2" bindtap="swichNav">Tab3</view>
 </view>
 
 <!--内容主体-->
 <swiper class="swiper" current="{{currentTab}}" duration="200" bindchange="swiperChange">
  <swiper-item>
   <view>我是tab1</view>
  </swiper-item>
  <swiper-item>
   <view>我是tab2</view>
  </swiper-item>
  <swiper-item>
   <view>我是tab3</view>
  </swiper-item>
 </swiper>
</view>

.page {
 margin-left: 10rpx;
 margin-right: 10rpx;
}
 
.swiper-tab {
 display: flex;
 flex-direction: row;
 line-height: 80rpx;
 border-bottom: 2rpx solid #777;
}
 
.tab-item {
 width: 33.3%;
 text-align: center;
 font-size: 15px;
 color: #777;
}
 
.swiper {
 height: 1100px;
 background: #dfdfdf;
}
 
.on {
 color: blue;
 border-bottom: 5rpx solid blue;
}